Hoist



W. H. BALTES..

HOIST.

APPLICATION FILED DEC. 8| 1920.

Patented Jan. 3, 1922.

WALTER H. BALTES, OF MILWAUKEE, WISCONSN.

nors'r. Y

incense.

Specification of Letters Patent.

Patented dan. 3, 1922.

pplcation filed. December 8, 1920. Serial No. 429,046.

To all w hom t may concern i Be it known that l, l' TALTER H. BAL'rns, a citizen of the United States, residing at Milwaukee, county oflvilwaulree and State of Wisconsin, have invented new and useful improvements in Hoists, of which the following is a specification.V

This invention relates to hoists and is particularly directed to a hand operated hoist. Objects of this invention are to provide a hoist of maximum strength without prof ducing an elaborate or bulky mechanism; to provide a hoist in which the strains are distributed so that no single bearingl is subjected to the major stresses; and to provide a hoist in which the major portion of the strains are borne by an integral structure thereby minimizing distortion, breakage, and the chains supporting parts becoming detached. Y

Further objects are to provide ahoist in which a minimum amount of machine worky is necessary and in which a relatively small number of parts is required.

Further objects are to provide a hand hoistin which the worm wheel housing is closed by the worm wheel, and in which the worm wheel housing` and hoisting drum 'support are of integral formation, thereby both materially lessening the cost of production and the chance of separation of the parts under stresses.

Further objects are to provide novel means of securing the parts in operative relation so that a very small number of operations is required in assembling, and to produce a hoist in which the time required forV assembling and tting the parts together is materially reduced. Y

An embodiment of the invention is shown in the accompanying drawings, in which- Fig. 1 is an end elevationV of the hoist.

Fig. 2 is a sec-tional elevation thereof on the line 2 2 of Fig. l.

Fig. 3 is a sectional view on the line 3-3 of Fig. 2.

Fig. t is a plan view of the hoist with parts shown in section.

The hoist comprises a casing 1 which has integrally formed therewith a bearing 5 spaced laterally from such casing and joined by means of members 2 and 3 and a vertical strut or connecting member d. The casing 1 is substantially cylindrical and is provided with inner' annular bearing faces 6 and 7 which are adapted to form bearing surfaces for the worm wheel 8. The face 7 is formed upon a member which has an outwardly projecting portion 9 adapted to fit within a correspondingly recessed portion of the worm wheel. The casing is open at both ends and has'at its lower portion a transverse cylindrical part 10 adapted to house the worm. rEhe inwardly directedrbearing member 5 may be centrally cored if desired to lighten the structure, and the upper or supporting port-ion of the strut i may be webbed or ianged to provide requisite strength. The casing'has swivelly joined thereto a supporting hook 11 which may be conveniently passed through the member 2, this supporting member being substantially in line with the load bearing chain of the hoist. The worm wheel 8 is provided with bearing faces 12 and 13 adapted to contact with the faces 6 and 7, the bearing being primarily at 7, although it may, if desired, be designed to have a bearing at the surface 6. The worm wheel 8 has integrally formed therewith a hoisting drum 14 which is hollow as indicated at 15 and designed to rest upon the bearing member 5 so as to secure anradditional bearing surface and thereby distribute the bearing stresses throughout a considerable extent of the supporting casing and frame.

A convenient means of retaining the worm wheel in place is to provide annular aligning recesses within the worm wheel and casing at the surfaces 6 and 12 and to place therein a split spring ring or washer 16. This washer has its ends 17 drawn together against the inherent resiliency of the washer and when in such contracted position, its diameter is substantially that of the corresponding portion of the worm wheel. lVhen in this condition, the worm wheel is slipped within the casing and the washer is allowed to expand thereby partially filling such annular recesses and holding the worm wheel in operative position within the casing.

The worm 18 is positioned within the housing 10 and'at its thrust end is provided with a steel bearing washer 19 which is centrally recessed and carried upon a projectllO forms a bearing lor such reduced portion. The casing is provided with outwardly projecting slotted ears 2% and the plate 22 is provided with openings aligning with such slots. Bolts pass through such openings and slots and serve to retain the plate in position to close the worm casing 10. VThe plate 22 is continued laterally upon each side of the driving wheel 26 and forms chain guides 27 upon each side of such wheel. These chain guides, it will be noted,

. line with the axis of the supporting hook 11 and is usually provided with a load engaging hook 31.

ln assembling the device, the worm 18 is iirst slipped into position with the bearing washer 19 thereon. The plate Q2 and driving wheel 26 are next slipped over the reduced portion 23; the plate being bolted in place and the wheel secured upon such reduced portion by means of a Set screw 32. Thereafter, the worm wheel is slipped through the enlarged open end of the casing 1 while the spring washer 16 is in conf tracted position, it of course being understood that the hoisting drum lll is slipped over the bearing member 5. Then in linal position, the spring washer will expand and loclr the worm and hoisting drum against lateral motion. The driving and load chains and the swivel supporting hook 11 are of course positioned upon the hoist in the usual manner. To facilitate insertion of the worm wheel after the worm is in place, certain of the teeth ot the worm wheel may be hobbed as indicated at 33 so that they may be slid over the worm when these teeth are in the proper position.

It will thus be seen that avery small number oi operations arerequired in assembling this hoist. The integral constructionV of the worm wheel and hoisting drum together with the integral construction of the bearing Vportions of the supporting casing insure an equalization of the stresses imposed upon the hoist and also a very desirable distribution of such stresses upon large bearing surfaces which both decreases the casing into which said worm wheel andl drum are adapted to be slipped, and an annular spring disk Yhaving cooperative engagement with said worm wheel and said casing for retaining said worm wheel with! in said casing.

3. A hoist comprising a driving worin, a driven worm wheel, a druml formed integrally with said worm wheel, andl an open ended casing into which said worm wheel and drum are slipped, said worm wheel and drum having a sliding engagement with'said casino' whereby said casing is completely closed by said drum and worm wheel, Aand whereby said casing Supports said worin wheel.

1l. A hoist comprising a driving worm, a

driven worm wheel, a hoisting drum formed integrally with said worm wheel, and a casing surrounding said worm'wheel and providing an exterior bearing therefor, and an interior bearing for said hoisting drum.

5. Ahoist comprising a driving member, a driven member, a drum formed integrally with said driven member, and a housing for said driven member, Said housing and driven member cooperating to form an exterior bearing for said driven member, and said housing and drum cooperating to form an interior bearing member for said drum.

6. A hoist comprising a driving worm. a hollow cup-shaped worm wheel driven by said worm, a hoisting drum formed integrally with said wormwheel, a casing ha'ving a housing for said worm and an annular housing for saidworm wheel, Said worm wheel when in position withinl saidv casing serving to close such annular housing and arranged to have bearing engagement therewith, an annular split spring member having cooperative engagement with said worm wheel and casing andserving to retain said worm wheel and easing in operative relation, andan interior bearing for said drum formed integrally with said casing.

WALTER H. BALTES. 

